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A satisfactory additive scheme for the C—H and C—C bond polarizability tensors has not yet been presented, but there is wide acceptance of appreciably different anisotropies for the two bonds. Theoretical estimates suggest comparable anisotropies for the two bonds and hence the related quantity ΓCC=(α∥–α⊥)C2H6 may be negative rather than positive as is widely assumed.
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Murrell et al. (1967) studied this question.
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